Can You Use CLR On Porcelain Tub?

Can You Use CLR On Porcelain Tub? Can you use CLR on porcelain tub? Use on most bathroom surfaces including: porcelain, ceramic tile, shower doors, sinks, bathtubs, white grout and caulk, toilet bowls, and fiberglass. Will not remove rust. Does CLR damage porcelain? CLR Septic System Treatment is safe on pipes and porcelain and works